The X Factor 2010: Changing the song at the very last moment can be a problem for most acts, but with these boys it became necessary to change their song choice during the week. With five of them needing to learn new words and routines could be problematic but they took to it easily. But with a lack of practice on this song - how will they perform Nobody Knows on the night? Download this performance from iTunes! Click here: http://bit.ly/xfactoritunes See more at http://itv.com/xfactor